Culture medium and device for detection and enumeration of enterobacteriaceae
First Claim
1. A bacterial culture medium comprising glucose and a pH indicatorbuffer system to detect and enumerate EntCrobacteriaceae growing in the medium wherein the medium contains selected amounts of glucose, pH indicator and buffer to prevent colored indicator zones from excessively diffusing in the medium.
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Abstract
This invention generally relates to products and processes used to determine the presence of Enterobacteriaceae in a sample and particularly relates to a bacterial culture medium which may be used in products and processes to allow early detection and enumeration of Enterobacteriaceae in a sample. The bacterial culture medium which facilitates the early detection and enumeration of Enterobacteriaceae contains a selected amount of glucose, pH indicator and buffer which prevent diffusion of colored indicator zones associated with growing bacteria in the medium.
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13 Claims
- 1. A bacterial culture medium comprising glucose and a pH indicatorbuffer system to detect and enumerate EntCrobacteriaceae growing in the medium wherein the medium contains selected amounts of glucose, pH indicator and buffer to prevent colored indicator zones from excessively diffusing in the medium.
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11. A method of detecting and enumerating Enterobactriaceae in a sample comprising the steps of adding an aliquot of a sample in an aqueous diluent to a culture medium containing selected amounts of glucose, pH indicator and buffer to prevent colored indicator zones from excessively diffusing in the medium, adjusting the pH of the aliquot to about 6.57-7.5;
- growing Enterobacteriaceae in the presence of the culture medium; and
detecting the color change of the pH indicator in the medium. - View Dependent Claims (12)
- growing Enterobacteriaceae in the presence of the culture medium; and
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13. A device to detect and enumerate Enterobacteriaceae in a sample consisting essentially of a coated self-supporting, waterproof substrate, a foam spacer and a transparent cover sheet, wherein a culture medium containing selected amounts of glucose, pH indicator and buffer to prevent colored indicator zones from excessively diffusing in the medium is coated on the self-supporting, waterproof substrate.
Specification